[ruby/prism] Add a reflection API for determining the fields of a node

https://github.com/ruby/prism/commit/f3f9950a74

1 files changed, 22 insertions, 0 deletions

diff --git a/test/prism/reflection_test.rb b/test/prism/reflection_test.rb
new file mode 100644
index 0000000000..869b68b1f8
--- /dev/null
+++ b/test/prism/reflection_test.rb
@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+
+require_relative "test_helper"
+
+module Prism
+  class ReflectionTest < TestCase
+    def test_fields_for
+      fields = Reflection.fields_for(CallNode)
+      methods = CallNode.instance_methods(false)
+
+      fields.each do |field|
+        if field.is_a?(Reflection::FlagsField)
+          field.flags.each do |flag|
+            assert_includes methods, flag
+          end
+        else
+          assert_includes methods, field.name
+        end
+      end
+    end
+  end
+end